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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea77d96911148e2e65fac9053ef9eed8e1786a40570e4f2b5e479872178e4aaf' 
  AND token = '+oW4QG8cGdGAesnXCYkbzIVAG/kUGs61h0aN+AMlpBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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