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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8ab61af4e0265a7a550cb9070e89f5aa410761f8f5086d0af4959f01f3d3d81' 
  AND token = '8uQ7XMmEw5tExd5W+eol8qzxqPTv+axS4DFzRGDzFp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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