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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25b9413a74137891e98c30cdbe587285ad81851a554498f02ed94307bf2d2384' 
  AND token = 'wEci7boC/Ic/uxJ3UXdbUGSGU7arLUnNCXU++u1Y+hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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