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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f75ff20e9c6778b699301995807b3ca577fd51a9739ea6119adda1db4b3a3779' 
  AND token = 'gH5KFOVqsi6IXy7VU5u1i6YF8jS/OwLTat/QD1meGiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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