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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edce89756ff96000226d2be31294ffe194dc39804848d2dc00c6376f33493b2e' 
  AND token = 'FqVyBnzKLHafqMDTEHgWEwKHqvN7C93PtX1E7l0m3YQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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