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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb50b74cc37f0a8a172d0abfe6b451c1e2f2c26b59137b7b67d01f5b82d68e5e' 
  AND token = 'n6xF6GlkOovA7v2yRAWM+Gd4GGVRqI5FAIFpuFGjCQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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