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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5a2d6259829c841bb5bac1b1dfa46a19f6f6ba5ae0483aa3c0b0e43f8d33d62' 
  AND token = '/UQlVM7XyuCsIQ7CZASuGCeX+gBWdVT564IOWInG8CE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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