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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c490a71b259902272b06a4141aecfe3a22ff9d9e0e74ae87e48894e02fb2b30' 
  AND token = 'kUsvwX7SsfETRBYblf4DRtBojAU1/49GBPEZ6Ty//gI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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