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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63cf93636e2d577c1fde4b7942b00156118258467c2621f8ffee71a0e57037ee' 
  AND token = 'kb0rEYfYDWpbQ5TbjrBcM0iFs0PyTRHD+IsE2PULmPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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