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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a70861c75be4f160176f6876d1a5297061f56274b7e34614b79b3f33d9d583e' 
  AND token = 'ViOZSl2sgS0d1pZEsTqgQ2dpZnCC9Z0U7IRgKC63Rok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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