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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e89b2c6ddba4e03b337207c55dbdac9ff60253995bba215a1cd1c1041774c7d' 
  AND token = 'BpyqFheVaw7rlkJfoTG0jEpnzNxN/Wih7kZOaUd4xMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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