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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ede44d96f42b2de3e85b292944a3c728f4b237a16f3377e6085cb700c8281dbf' 
  AND token = 'plYwbEnKU5jTfo54GpJIziR5oED4t5pCtndIUNszBpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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