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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ce26c8337aa35a727322b22b8cd8c8358dbb7ddcb02d611d1e46c4bcf3744ea' 
  AND token = 'KBP2bJ5x8nwTFwfcHNXD01g3kEDuX2ivbEsC2GgoncM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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