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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '012fa30135331f33a61aa121d878c5ed5975bb92ed603ea3aa0fdfd7857362bb' 
  AND token = 'RGj7SRtgm2r/RyjlSEzr8/aw6Wp43GbnuUrt5axo8O4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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