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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '470cbc55f9a7d1e1a06dc2cbd30234d6276eba60f924d332156e981b6ab8c85b' 
  AND token = 'q83xGk7FokpfWWB0U3I8gemsJcThFdCD/rC1oQ5BJIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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