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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83e58f2c5d32a7ba7755106a5caea0257878f2210e05bd7c0d03317c025afecb' 
  AND token = '5FMN11jNWc2Uwdr3NIJv5F5TZRswfXPQtb1dRXO5/IM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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