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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54b7da6461eacaf6eb35022cca4a1367b4d59244ba28fc3c234ca915c1f0b319' 
  AND token = 'HjOuf2cVHLgRIJpLBI3OFMSbz5DY32FNbJwV4TL6do4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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