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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9551e849dd0a694dc93d852a2bc262c3ecd94bc2b0a07ba3063eb2bbb5f35ea6' 
  AND token = 'ZQyDhRy3fR4cTi9io9/jSYr4VcPROWMvjLFww1twrww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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