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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e810fd9f65c8ad42411ae0a42651a5211bb20d477a9991f7f99583c596e5c45' 
  AND token = '6RxLINBEuLOqGzaX7VmIzZBPEMA20rn2g5qPIRYM1Yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}