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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fafa910eb8fa4ebb49ac781b3dd8760037ed539ddec3ba020bc9f93637c45fbf' 
  AND token = 'tAflZji6F7bGe5BHX2ofzzaucte383kRNYgube2aBNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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