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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39e13855233c14b7391a318b322b6466c26a87d013dd7081dd125e50960452dc' 
  AND token = 'oCFtNs1r3YCCzb4Em0b6/V0X7Y87smedqDw7jeXzS4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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