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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2775307b4a6b0ae6612db94f0e326b267d975231a44f04321fa9238caea95269' 
  AND token = 'zorJG9+QHl6DMF3Ol5Tbk5hb3ch9Cc8GU02Sk64QNHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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