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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48e2ab2579b9e27d0927beb225e0b534357376012037a664b9ad3fe4e6c6118b' 
  AND token = 'Nq5EpfaGeD/4Z/oCMzdmzkuIIgwwTrzu+oP0co3xDhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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