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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b25e06e11fd6dee0ab63c483ff7db15d82a8a4a4a5d9785608564df8108f5dbb' 
  AND token = '1B/dQ/abWUSRXDvxzNGdM5JdipbxDtkQXXF8ooXs3uM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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