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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b4efe0532c09dad85af814f74dea2b5bc11e793270b68776180c072f878ecb2' 
  AND token = 'R6jJjfaXDvI1fDxeusGe9u2OmJqLyJVCZO2uRJQWzNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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