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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23fccb244b6e6d5d95ad9c6787800fb678491ec78c0287861f59f15080f30da7' 
  AND token = 'ibFdQosn00jc6E/bHlVSqkr5s0NHfscI9g45aIQKne8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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