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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faca637b82e0659ece6136302e106fc533af19e9bead2beeeea8142d205241f3' 
  AND token = 'Ob96gl3OKSoRnD+gdaIzCOGUB/4hjpLJoi7ayEeP9o0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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