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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f52b909ec217d5e6f7f1e67fe20681a478394c865a86790742b778410c4c50b0' 
  AND token = '3uAXEuVUd+KAU7P90daA78uywmjs4EegVqU1Rb7QoVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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