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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18d7a395311d8b56a8b28e8a4f3d83a9700ff2be45182406dd378e91992bc4f7' 
  AND token = 'IJNWMRBAt6F3lLf22QC2YqaNRIwUVemGOtybhs0DEvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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