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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da032665a92d2acd1c4a30435ab8811890fb7b42a2a177defe844193bdb3923b' 
  AND token = 'cdiGa3dsAiY+9giMpeQykEKa76kO89lyQlQn1h0SmCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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