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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '102c9a1fda4c1177980d9e0b33a897282ea49016cc7f8a594f8d9fe046bf2798' 
  AND token = '+JynB+zhoDIDTilvkoc+41s0ME3y3B/OE5iOFVbX+KU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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