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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55f146f15c06a1ed2b5a48b73e92526b47de23054d4f5cbc356f240ec46803fa' 
  AND token = 'adhjB1nXkHS6EIolBsx9BqdTa0uVNv0dtRwIZA9i3WQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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