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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3ee35de44964d7f5aee2050895eb9c73b62e971da50ace8e3622cfabd89d5b3' 
  AND token = '94DNuOtzEkyEqKueRP0hvWVb89N3VeSoWj/gcr0E4Xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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