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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f22aa591d6567d99fe97fd22fcc6d52e4972be02e73d079704bae25a7746e80' 
  AND token = 'oPLEIKZSm+RIHF3BhQQpDkx3eNqFKWLScLNGrLp+HPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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