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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1f16211883880291c5fc7bcf61fba7223dc26c5e428953ba085ef2ec2edc5df' 
  AND token = 'rux2lf6MVD7fhJ5pWtdGEhr7Z1E2MZDmc21bhaJ1z3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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