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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bd0a373fb090688587a12d3ca2ab3f868036a09b8e15732c61856884ce0e72b' 
  AND token = '2y/ErzrIniROVQTNLhwmoh8U+Zuy4X5fuH/FMIjpyW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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