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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2934877050420aad3baac9b55f017fb94e9fef3ded0ad98d6e4d1dc26d0219d8' 
  AND token = 'lf+wL/Svm2zHY6Ri2P2gxieKVb+0hidS12aYehduxn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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