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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b3beeb5266669a1b462788afd0f2c191ccd4fd80206208888224d2d057d147f' 
  AND token = 'nfFgz3tusTPVG2Fyd6s47Ab90FH1ff1ajxn6c774pCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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