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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fee87d438eb00250406c1eddea335afd753e59d635fc75d1d0229d6a1c3d287e' 
  AND token = 'F49EaBu95z9Gw9gvoHlm52/zbypxzKVKbfl3tF8t3Mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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