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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7751238573ff1c1e32bc269d5bbc8be1b72696033bfe7d5dc2c31d34ebb690cf' 
  AND token = 'XM9dJEryVoJQ8N/akZb+ofD4DMXRM3RjeNjUT6uTGE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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