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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e83bd8322894a73cd2a7265878b2f07205fa19b46c2d02bf2dbe14dfc2deb84e' 
  AND token = 'kQKptxl1dGqzQLO13zg7tpi4M2unSRH1gVmpNTss6Ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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