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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ffeb0e0291c5fdd520843bac30d8617253addff03c987e61cd0b1294d0fedfc' 
  AND token = '/PW2DSVUc9ymazW5D90nvPw7Xq4zkRBXw3/GsMj6YDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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