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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da67d29bdaa72da2d928ce7412dfcca3d74b7fd8aa5be8bf4395093ac50570db' 
  AND token = 'EAH0eOJsLV9I3KxRpVtpKdlw5P0iQLiJdI74fIS+t9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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