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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '646d1a63ea9c3a408549b829c9d11af6e635608e3f28a3e1b1d4029d4520e47a' 
  AND token = 'CIdOl8Of894qYJ0ZTAXFBLBUZNFFHpAJAtLlqi2AMsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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