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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94a7e6c109e1af2cc73e380e3b4b2ae680baf1f8e8db262b1d00ce224694658f' 
  AND token = 'J62Ko3rr915JGAYxg6T3pR2v3svlVcNYheAMLNr5p04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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