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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83d477cfe20849b9bf89051bb823d949c9e296782b6224e5cb739f367593e4d0' 
  AND token = '0ygdQqSO1jtLgmnLj5MIBMRMgPINPW0Ya2fY1rNDEgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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