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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '878a39c143f9471de3f2c562e1d79a54b128754abce12a8cb14b57f667930d9e' 
  AND token = 'DsvMahyYH7cWjr0Hn306H0zoFdFJogEMR35jI4v3RLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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