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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a12abe56f7c452a870d8fc31f43d3a0fac00070cd2047212b9070f35b1785cd' 
  AND token = 'c0WJRZfa3Xi56Uqw4K1gEe3LBu1ccBcXLQLEe3x6PfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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