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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '968de566e5069006bb396cb7ec1d99dacea6e17e1961623262bf00db08312938' 
  AND token = 'J+AZOAUlynw89HH+s4NWCrNFNwV1/Yi9CCdnqh1mZLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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