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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a70e996debeba12278731b1a618da054cc407e241edc3f9e2a9659050682fe0' 
  AND token = 'qDv9oo7kTIZTrK4SlH+uib9deVHogk1Hsg2x6CJaoqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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