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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8f440da88a89196888786b62d35ef03125b24750a56b7e2d70ef30ee0a0dd39' 
  AND token = 'WO4nJC2YcxJ7F69XJB8bWd6RK4wtA5Y7ZE18LhMYWtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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