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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbf4fd2718b5c5944315cea13c3f69f196b16b8d6f68be418d49245c6f29b20a' 
  AND token = '0/dds1uWc5MmnSXp0hrtyfiSJsb/f2wZX4qm724G7hM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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