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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08b9fab3295ab332a30a5639447591f27ee2b20532fa723b0bb3ef433cfa1494' 
  AND token = 'hNlUPsRj1VlwTOFlu56Rn0XLBqtzaib1DNdt4WNp1Lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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