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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62dfc999466352b43388f6e3f96471af00c9c6a16bb35316b8ef8e80c83dabe8' 
  AND token = '7uV5Ql8qUFoCBvk9sYdHcYZ2kN8eAll3RSmEzdDDqHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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