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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '824784d2da89786bd055a2adf70926f3ee772681c9ac0d0d3cae1ad779d0a6e3' 
  AND token = '8tvqdduWsz76bz7Je6IKxtx80vdbViRE40L0yMYHBuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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