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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40696434fd46d0f0a059c33f4a2a75b339dcd5e43fced80dde0e7313b1992c2e' 
  AND token = '5NWKZMwDp6323L8rvSntKk/97I4NWbZ0IeH+GqIYGyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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