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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '139a0255e560163207dd6d126b75302a8facfd577edbc577261a6de70b781057' 
  AND token = 'veM2NBTrQZbxd8GXGiiEYH0+i7UrjX4/ArpaOTfhAgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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