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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90a4d4a519a6c89641026cb9276d3fc17fd1490f2879dafa178608ec1130a741' 
  AND token = 'bM3U8e+rAKQi6G/CsGW9EJD+A6GVDCiNdu7MRN/ucto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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