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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd802a364796d996e2332977aa10e0b8b41acc0a521ed45007b5f66de682ea75a' 
  AND token = 'NxN5yTr1KvN/IcnM5l0R9LUvpi8daZ70HvSUqRMstX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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