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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc83a3cbbf2a7eafbfa3d04018a489bd450a003874d7b68ebf290c943c9fe9c2' 
  AND token = '+TEuRnunwiy3crPrt3Wx11QL8vY+nsPwTCY1/RQ/FpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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