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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '623132a45224ac4580ee8361bd2aa16cd6b061f6364aecaf9859e3690bb688a8' 
  AND token = 'tEeDIbmCdlGsjysyN3gJIHafeiwFP9T/04dl4B+Qx/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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